initial import of x11perf-1.7.0

initial import of x11perf-1.6.1

initial import of x11perf 1.5.4. changes include:
- Add tests for ShmGetImage

initial import of x11perf-1.5.3:
- fix overflow bugs
- fixes Xft bugs
- add -falseprecision flag

initial import of x11perf-1.5.1

initial import of x11perf-1.4.1